[PATCH] D102642: [LangRef] update according to unwinding support in inline asm

[Paul via Phabricator via llvm-commits]

cynecx updated this revision to Diff 345971.
cynecx edited the summary of this revision.
cynecx added a comment.

UB when "non-unwindable" inline asm unwinds.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D102642/new/

https://reviews.llvm.org/D102642

Files:
  llvm/docs/LangRef.rst


Index: llvm/docs/LangRef.rst
===================================================================
--- llvm/docs/LangRef.rst
+++ llvm/docs/LangRef.rst
@@ -4300,9 +4300,20 @@
 
     call void asm inteldialect "eieio", ""()
 
-If multiple keywords appear the '``sideeffect``' keyword must come
-first, the '``alignstack``' keyword second and the '``inteldialect``'
-keyword last.
+In the case that the inline asm might unwind the stack,
+the '``unwind``' keyword must be used, so that the compiler emits
+unwinding information:
+
+.. code-block:: llvm
+
+    call void asm unwind "call func", ""()
+
+If the inline asm unwinds the stack and isn't marked with
+the '``unwind``' keyword, the behavior is undefined.
+
+If multiple keywords appear, the '``sideeffect``' keyword must come
+first, the '``alignstack``' keyword second, the '``inteldialect``' keyword
+third and the '``unwind``' keyword last.
 
 Inline Asm Constraint String
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^


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